CN110858271A - Electronic passive tag identification system and method based on frequency selection characteristic - Google Patents
Electronic passive tag identification system and method based on frequency selection characteristic Download PDFInfo
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- CN110858271A CN110858271A CN201810977077.2A CN201810977077A CN110858271A CN 110858271 A CN110858271 A CN 110858271A CN 201810977077 A CN201810977077 A CN 201810977077A CN 110858271 A CN110858271 A CN 110858271A
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- 238000012545 processing Methods 0.000 claims abstract description 37
- 108091026890 Coding region Proteins 0.000 claims abstract description 20
- 238000002592 echocardiography Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 22
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- 230000003287 optical effect Effects 0.000 abstract description 4
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10108—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. interrogating only those RFIDs that fulfill a predetermined requirement, e.g. selecting all RFIDs having the same speed and moving in a cloud like fashion, e.g. on the same train; interrogating only RFIDs having a certain predetermined temperature, e.g. in the same fridge, another possibility being the active ignoring of a group of tags that fulfill a predetermined requirement, equivalent to the Boolean NOT operation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
Abstract
The invention discloses an electronic passive tag identification system based on frequency selection characteristics, which comprises a detection radar and a passive tag with frequency selection characteristics, wherein the detection radar transmits electromagnetic waves to the surface of the passive tag, the surface of the passive tag reflects echoes to the detection radar, the detection radar carries out signal processing, and corresponding tag information is obtained by matching a database according to an accumulated coding sequence result of the signal processing. The passive tag system based on the frequency selection characteristic does not contain an IC chip, tag information identification is carried out through analyzing radar echo signals, mechanical or optical contact does not need to be established between the identification system and a specific target, the tags can be identified all the day long, the accuracy of severe weather identification is particularly improved, the passive tag system based on the frequency selection characteristic has great significance for improving the anti-interference capacity of tag identification, and the application problem of the passive tag based on the frequency selection characteristic is solved.
Description
Technical Field
The invention relates to an electronic passive tag system, belongs to the technical field of electronic tag design, is suitable for identifying an electronic tag all day long, especially in the weather with low visibility, and particularly relates to an electronic passive tag identification system and method based on frequency selection characteristics.
Background
With the wide application of the internet of things in the transportation, logistics, industry, commercial retail and other industries, the number of articles to which passive tags need to be attached rises sharply. The existing optical recognition system in China at present still has the problem of unstable all-weather recognition rate, when the vehicle images are optically collected, the vehicle images can be influenced by the change of ambient light, the labels can also have the fuzzy distortion caused by stain, fading, inclination and movement, the recognition accuracy is influenced to a certain extent, and even more, the information is more difficult to recognize by the optical system under the condition of low visibility caused by severe weather such as haze, sand storm and the like. In addition, there are two kinds of radio frequency tags, namely active radio frequency tag and passive radio frequency tag, the working principle is to obtain data from the reader, process the data and feed back to the reading system, when the energy received by the tag antenna is insufficient, the IC chip in the tag can not work, which determines that the communication distance between the tag and the reader cannot be too far, thus greatly limiting the flexibility of the tag use, and the IC chip has the functions of reading, writing and rewriting at present, therefore the stored information is easy to rewrite or wrote, greatly reducing the safety of the system, and greatly inhibiting the universality of the system.
Disclosure of Invention
The invention provides an electronic passive tag identification system based on frequency selection characteristics for overcoming the defects in the prior art, which is characterized by comprising a detection radar and a passive tag with frequency selection characteristics, wherein the detection radar transmits electromagnetic waves to the surface of the passive tag, the surface of the passive tag reflects echoes to the detection radar, the detection radar performs signal processing, and a database is matched according to the accumulated coding sequence result of the signal processing to acquire corresponding tag information.
Specifically, the detection radar comprises a radar antenna, a transceiving channel and a signal processor, wherein the radar antenna is used for transmitting and receiving radar signals, the transceiving channel is used for transmitting radar signals, and the signal processor is used for processing signals and identifying coded sequences.
Specifically, the radar antenna is a broadband transceiving antenna, and completes the transmitting and receiving functions of a broadband radar signal; the receiving and transmitting channels comprise a broadband transmitting channel and a multi-channel receiving channel, the broadband transmitting channel performs signal frequency point switching and signal up-conversion to form radio frequency signals, and the multi-channel receiving channel performs signal frequency point switching and signal down-conversion to form baseband signals; the signal processor is used as a processing and control core of the radar to generate baseband signals, perform analog/digital conversion and radar time sequence control, perform signal up-conversion through the transceiving channel and finally transmit radio frequency signals through the broadband transceiving antenna; the signal processor is stored with a label information database, receives echoes transmitted by a multi-channel receiving channel, and performs analog/digital conversion, signal detection, frequency point identification, coding sequence generation and label information database query matching.
Specifically, the passive tag has frequency selection characteristics, and has frequency gating characteristics for electromagnetic waves in different frequency bands.
Specifically, the frequency selective material of the passive tag is S1～SNN blocks of different materials are formed, and the frequency points are respectively F1～FNTherefore, each piece of material only allows the electromagnetic wave at the frequency point to pass through, and simultaneously filters the electromagnetic waves at other frequency points to form a band-pass or band-stop filter.
Specifically, the detection radar transmits the signals with the frequency F in sequence1～FNTo a passive tag surface.
The identification method of the electronic passive tag identification system based on the frequency selection characteristic is characterized by comprising the following steps of:
step 1, establishing a tag information database and storing the tag information database in a signal processor of a detection radar;
step 2, sequentially transmitting frequency F by the detection radar1～FNTo the passive tag surface;
and 4, inquiring and matching the tag information database according to the accumulated effective coding sequences to obtain corresponding tag information.
Optionally, in step 1, optionally, a tag information database is established and stored in a server in communication with the detection radar, so that the step 4 calls to perform query and matching on the tag information database.
The passive tag system based on the frequency selection characteristic does not contain an IC chip, tag information identification is carried out by analyzing radar echo signals, mechanical or optical contact is not required to be established between the identification system and a specific target, the tags can be identified all the day long, the accuracy of severe weather identification is particularly improved, the passive tag system based on the frequency selection characteristic has important significance for improving the anti-interference capability of tag identification, and the application problem of the passive tag based on the frequency selection characteristic is solved.
Drawings
FIG. 1 is a schematic diagram of the components of a detection radar of the present invention;
FIG. 2 is a schematic diagram of frequency points of a label material according to the present invention;
FIG. 3 is a general flow chart of the present invention for obtaining tag information;
FIG. 4 is a diagram illustrating the transmission and reception of electromagnetic waves according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, a passive tag system based on frequency selection characteristics includes a detection radar and a passive tag with frequency selection characteristics, where the detection radar transmits electromagnetic waves to a surface of the passive tag, the surface of the passive tag reflects echoes to the detection radar, the detection radar performs signal processing, and matches a tag information database according to an accumulated result of a coding sequence of the signal processing, in this embodiment, there are 6 pieces of frequency selection materials with different frequency points on the surface, respectively transmits electromagnetic waves with frequencies of f 1-f 6 to the surface of the tag, receives echoes of f1 and processes data, records signal parameters, obtains a coding sequence, which is a processing result, sequentially receives and processes the echoes of f 2-f 6, obtains the remaining 5 processing results, and queries the tag information database according to the 6 accumulated processing results, and obtains corresponding tag information. Each permutation and combination of the frequency point information and the coding sequence corresponds to unique label information, and the label information database reflects the one-to-one correspondence relationship. The application problem of the passive tag based on the frequency selection characteristic is solved.
In this embodiment, the detection radar includes a radar antenna, a transceiver channel, and a signal processor, and the three cooperate to perform the functions of electromagnetic wave transceiving, signal processing, and code sequence identification. The radar antenna is used for transmitting and receiving radar signals, the transceiving channel is used for transmitting the radar signals, and the signal processor is used for processing the signals and identifying coded sequences. Namely, the detection radar has the functions of electromagnetic wave receiving and transmitting, signal processing and coding sequence identification.
In this embodiment, the radar antenna is a broadband transceiving antenna, and completes the transmitting and receiving functions of a broadband radar signal; the receiving and transmitting channels comprise a broadband transmitting channel and a multi-channel receiving channel, the broadband transmitting channel performs signal frequency point switching and signal up-conversion to form radio frequency signals, and the multi-channel receiving channel performs signal frequency point switching and signal down-conversion to form baseband signals; the signal processor is used as a processing and control core of the radar, receives a return signal, performs down-conversion, generates a baseband signal, performs analog/digital conversion and radar time sequence control, performs signal up-conversion through the transceiving channel, and finally transmits a radio frequency signal through the broadband transceiving antenna; the signal processor receives the echo transmitted by the multi-channel receiving channel, and performs analog/digital conversion, signal detection, frequency point identification, coding sequence generation and database query matching.
In this embodiment, the passive tag has a frequency selection characteristic, and has a frequency gating characteristic for electromagnetic waves in different frequency bands. Namely, the label has a frequency selection function and has frequency gating characteristics for electromagnetic waves in different frequency bands. Each piece of frequency selection material has a frequency point, and only the electromagnetic wave of the frequency point is allowed to pass through.
Referring to fig. 2, in the present embodiment, the frequency selective material of the passive tag is S1～SNN blocks of different materials are formed, and the frequency points are respectively F1～FNSo that each piece of material only allows the electromagnetic waves at the frequency point to pass through, and simultaneously filters the electromagnetic waves at other frequency points, such as the material S1Only passing frequency F1Forming a band-pass or band-stop filter.
In this embodiment, the frequency of the radar transmitted by the detection radar is F1～FNThe detection radar receives echo signals reflected by the passive tag, down-conversion and signal processing are completed, processing results are accumulated to form an effective data coding sequence, and tag information database inquiry matching is carried out according to the accumulated processing results to obtain corresponding tag information. In this embodiment, the tag information database is a license plate number, such as jing a 00000.
In another embodiment, the tag information database is a cargo tag of a port and a terminal, and generally includes information such as a cargo name, a cargo serial number, a cargo origin, and the like.
Referring to fig. 3, in summary, the passive tag identification method of the passive tag system based on frequency selective characteristics of the present invention includes the following steps:
step 1, establishing a tag information database and storing the tag information database in a signal processor of a detection radar;
step 2, sequentially transmitting frequency F by the detection radar1～FNTo the passive tag surface;
first of all with a transmission frequency of F1To the surface of the tag,
referring to fig. 4, the radar is switched to a transmit mode, selecting a frequency F, based on the system operating conditions1The channel(s) emits electromagnetic waves;
according to the working state of the system, the radar is switched to a receiving mode, a channel of the current frequency point is selected, an echo is received, down-conversion filtering processing, analog-to-digital conversion, amplitude detection and the like are carried out, and signal processing and parameter measurement of the current frequency point are completed; generating an effective data coding sequence;
then sequentially transmitting the frequenciesIs F2～FNThe electromagnetic wave reaches the surface of the label, and step 3 is repeated to accumulate the processing result;
according to the system working process, sequentially completing the frequency of F2～FNThe electromagnetic wave signals are transmitted and received, corresponding processing is carried out, and the processing results are accumulated to form an effective data coding sequence;
in this example F1～FNAnd 6 of the medium N are taken, 6 frequency selection materials with different frequencies are arranged on the surface, electromagnetic waves with the frequencies of F1-F6 are respectively sent to the surface of the label, the echo of F1 is received and data are processed, signal parameters are recorded, a coding sequence is obtained, the coding sequence is a processing result, the echo of F2-F6 is sequentially received and processed, the remaining 5 processing results are obtained, and a database is inquired according to the 6 accumulated processing results to obtain label information.
And 4, inquiring a tag information database according to the accumulated processing results to acquire corresponding tag information.
In another embodiment, in step 1, a tag information database is established and stored in a server capable of communicating with the detection radar, so that the step 4 calls to perform query and matching on the tag information database.
Determining a material frequency point based on frequency selection characteristics, determining a signal parameter (polarization angle of a frequency selection material in the embodiment) based on signal processing, determining a unique coding sequence by combining two-dimensional information, frequency point information and polarization angle information of the frequency selection material, wherein the bottom layer of the coding sequence is represented by binary, and querying a tag information database according to the coding sequence to obtain corresponding tag information, as shown in table 1.
TABLE 1 material frequency point and Signal parameter combinations
Claims (8)
1. The electronic passive tag identification system based on the frequency selection characteristic is characterized by comprising a detection radar and a passive tag with the frequency selection characteristic, wherein the detection radar transmits electromagnetic waves to the surface of the passive tag, the surface of the passive tag reflects echoes to the detection radar, the detection radar carries out signal processing, and corresponding tag information is acquired according to the result matching database of an accumulated signal processing coding sequence.
2. The electronic passive tag identification system based on frequency selective characteristics according to claim 1, wherein the detection radar comprises a radar antenna, a transceiving channel and a signal processor, the radar antenna is used for transmitting and receiving radar signals, the transceiving channel is used for transmitting radar signals, and the signal processor is used for processing signals and identifying coded sequences.
3. The electronic passive tag identification system based on frequency selective characteristics according to claim 2, wherein the radar antenna is a broadband transceiving antenna, and performs functions of transmitting and receiving broadband radar signals; the receiving and transmitting channels comprise a broadband transmitting channel and a multi-channel receiving channel, the broadband transmitting channel performs signal frequency point switching and signal up-conversion to form radio frequency signals, and the multi-channel receiving channel performs signal frequency point switching and signal down-conversion to form baseband signals; the signal processor is used as a processing and control core of the radar to generate baseband signals, perform analog/digital conversion and radar time sequence control, perform signal up-conversion through the transceiving channel and finally transmit radio frequency signals through the broadband transceiving antenna; the signal processor is stored with a label information database, receives echoes transmitted by a multi-channel receiving channel, and performs analog/digital conversion, signal detection, frequency point identification, coding sequence generation and label information database query matching.
4. The electronic passive tag identification system based on frequency selective characteristics according to claim 1, wherein the passive tag has frequency selective characteristics, and has frequency gating characteristics for electromagnetic waves of different frequency bands.
5. Frequency-based selection according to claim 4Electronic passive tag identification system of the character, characterized in that the frequency selective material of said passive tag consists of S1～SNN blocks of different materials are formed, and the frequency points are respectively F1～FNTherefore, each piece of material only allows the electromagnetic wave at the frequency point to pass through, and simultaneously filters the electromagnetic waves at other frequency points to form a band-pass or band-stop filter.
6. The system according to claim 5, wherein the detection radar sequentially transmits signals with a frequency F1～FNTo a passive tag surface.
7. The identification method of the electronic passive tag identification system based on the frequency selection characteristic according to any one of claims 1-6, characterized by comprising the following steps:
step 1, establishing a tag information database and storing the tag information database in a signal processor of a detection radar;
step 2, sequentially transmitting frequency F by the detection radar1～FNTo the passive tag surface;
step 3, the detection radar receives the echo signal reflected by the passive tag, and down-conversion and signal processing are completed; accumulating the signal processing results to generate an effective coding sequence;
and 4, inquiring and matching the tag information database according to the accumulated effective coding sequences to obtain corresponding tag information.
8. The identification method of the electronic passive tag identification system based on the frequency selection characteristic as claimed in claim 7, wherein in the step 1, optionally, a tag information database is established and stored in a server communicating with the detection radar, so that the step 4 can be invoked for querying and matching the tag information database.
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| CN201810977077.2A CN110858271B (en) | 2018-08-26 | Electronic passive tag identification system and method based on frequency selection characteristics |
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1195847A2 (en) * | 2000-10-04 | 2002-04-10 | E-Tenna Corporation | Multi-resonant, high-impedance surfaces containing loaded-loop frequency selective surfaces |
| CN101064014A (en) * | 2006-04-30 | 2007-10-31 | 中国科学院声学研究所 | Non-contact passive radio frequency label and reading system thereof |
| US20080252426A1 (en) * | 2005-02-07 | 2008-10-16 | C & S Microwave Co., Ltd. | Intelligent Rfid System For Low Powered Reader-Tag Communication and Method Thereof |
| CN101706878A (en) * | 2008-08-26 | 2010-05-12 | 王莹 | Passive RFID system |
| JP2010193214A (en) * | 2009-02-18 | 2010-09-02 | Brother Ind Ltd | Radio-frequency tag communication device |
| CN102236089A (en) * | 2010-04-28 | 2011-11-09 | 中国科学院电子学研究所 | Transceiving system of synthetic aperture radar with super-high resolution |
| US20120268308A1 (en) * | 2008-06-05 | 2012-10-25 | Keystone Technology Solutions, Llc | Systems and Methods to Use Radar in RFID Systems |
| US20130201003A1 (en) * | 2010-04-26 | 2013-08-08 | Sithamparanathan Sabesan | Rfid tag location systems |
| WO2015007982A1 (en) * | 2013-07-17 | 2015-01-22 | Centre National De La Recherche Scientifique | Time-reversal electromagnetic chamber |
| CN105139047A (en) * | 2015-08-19 | 2015-12-09 | 南京理工大学 | Polarized RFID system without chips |
| CN106295448A (en) * | 2016-08-16 | 2017-01-04 | 杭州思创汇联科技有限公司 | Strengthen the method that UHF passive RFID tags group reads precision and reading efficiency |
| CN106329041A (en) * | 2016-09-26 | 2017-01-11 | 南京航空航天大学 | Multifunctional active frequency selective surface and control method thereof |
| CN205942765U (en) * | 2016-06-03 | 2017-02-08 | 白煦 | Distributing type antenna system control label |
| CN106921019A (en) * | 2015-12-28 | 2017-07-04 | 航天信息股份有限公司 | A kind of RFID label tag communication system and communication means |
| CN107678023A (en) * | 2017-10-10 | 2018-02-09 | 芜湖华创光电科技有限公司 | A kind of passive location and identifying system to civilian unmanned plane |
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1195847A2 (en) * | 2000-10-04 | 2002-04-10 | E-Tenna Corporation | Multi-resonant, high-impedance surfaces containing loaded-loop frequency selective surfaces |
| US20080252426A1 (en) * | 2005-02-07 | 2008-10-16 | C & S Microwave Co., Ltd. | Intelligent Rfid System For Low Powered Reader-Tag Communication and Method Thereof |
| CN101064014A (en) * | 2006-04-30 | 2007-10-31 | 中国科学院声学研究所 | Non-contact passive radio frequency label and reading system thereof |
| US20160363662A1 (en) * | 2008-06-05 | 2016-12-15 | Micron Technology, Inc. | Systems and methods to use radar in rfid systems |
| US20120268308A1 (en) * | 2008-06-05 | 2012-10-25 | Keystone Technology Solutions, Llc | Systems and Methods to Use Radar in RFID Systems |
| CN101706878A (en) * | 2008-08-26 | 2010-05-12 | 王莹 | Passive RFID system |
| JP2010193214A (en) * | 2009-02-18 | 2010-09-02 | Brother Ind Ltd | Radio-frequency tag communication device |
| US20130201003A1 (en) * | 2010-04-26 | 2013-08-08 | Sithamparanathan Sabesan | Rfid tag location systems |
| CN102236089A (en) * | 2010-04-28 | 2011-11-09 | 中国科学院电子学研究所 | Transceiving system of synthetic aperture radar with super-high resolution |
| WO2015007982A1 (en) * | 2013-07-17 | 2015-01-22 | Centre National De La Recherche Scientifique | Time-reversal electromagnetic chamber |
| CN105139047A (en) * | 2015-08-19 | 2015-12-09 | 南京理工大学 | Polarized RFID system without chips |
| CN106921019A (en) * | 2015-12-28 | 2017-07-04 | 航天信息股份有限公司 | A kind of RFID label tag communication system and communication means |
| CN205942765U (en) * | 2016-06-03 | 2017-02-08 | 白煦 | Distributing type antenna system control label |
| CN106295448A (en) * | 2016-08-16 | 2017-01-04 | 杭州思创汇联科技有限公司 | Strengthen the method that UHF passive RFID tags group reads precision and reading efficiency |
| CN106329041A (en) * | 2016-09-26 | 2017-01-11 | 南京航空航天大学 | Multifunctional active frequency selective surface and control method thereof |
| CN107678023A (en) * | 2017-10-10 | 2018-02-09 | 芜湖华创光电科技有限公司 | A kind of passive location and identifying system to civilian unmanned plane |
Non-Patent Citations (4)
| Title |
|---|
| 代一平，邹传云: "基于 FSS 的无芯RFID标签结构", 《通信技术》, vol. 49, no. 1, pages 103 - 107 * |
| 左正璞: "无芯片RFID标签结构的研究与设计", 《硕士电子期刊》 * |
| 朱任卿;钱嵩松;万婷;: "基于Omega单元的频率选择表面特性研究", 微波学报, no. 1, 29 December 2017 (2017-12-29) * |
| 李慧心: "无芯片RFID标签的研究与设计", 《硕士电子期刊》 * |
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